656604066 has 16 divisors (see below), whose sum is σ = 1343748384. Its totient is φ = 213777984.

The previous prime is 656604049. The next prime is 656604103. The reversal of 656604066 is 660406656.

It is a super-2 number, since 2×656604066² = 862257798975464712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272231 + ... + 1272746.

It is an arithmetic number, because the mean of its divisors is an integer number (83984274).

Almost surely, 2^656604066 is an apocalyptic number.

656604066 is an abundant number, since it is smaller than the sum of its proper divisors (687144318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656604066 is a wasteful number, since it uses less digits than its factorization.

656604066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545025.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 656604066 is about 25624.2866437292. The cubic root of 656604066 is about 869.1629179297.

The spelling of 656604066 in words is "six hundred fifty-six million, six hundred four thousand, sixty-six".